4-ethynylpiperidin-4-ol

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of 16.5 g of 3,3-diphenyl-2-propenyl bromide in 70 ml of acetone is added dropwise to a mixture of 7.5 g of 4-ethynyl-4-hydroxypiperidine, 8.5 g of anhydrous potassium carbonate and 75 ml of anhydrous acetone at room temperature over 45 minutes, then the reaction mixture is stirred at room temperature for one hour. After filtering off the inorganic salts the solution is evaporated under reduced pressure. The residue is taken up in benzene, washed with water, dried over anhydrous sodium sulfate and the solution is evaporated under reduced pressure. After recrystallizing the residue from acetonitrile the title product is obtained in 68.4% yield, m.p.: 122°-123° C. After filtering off the inorganic salts the solution is evaporated under reduced pressure washed with water dried over anhydrous sodium sulfate the solution is evaporated under reduced pressure After recrystallizing the residue from acetonitrile the title product is obtained in 68.4% yield, m.p.: 122°-123° C.

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of 16.5 g of 3,3-diphenyl-2-propenyl bromide in 70 ml of acetone is added dropwise to a mixture of 7.5 g of 4-ethynyl-4-hydroxypiperidine, 8.5 g of anhydrous potassium carbonate and 75 ml of anhydrous acetone at room temperature over 45 minutes, then the reaction mixture is stirred at room temperature for one hour. After filtering off the inorganic salts the solution is evaporated under reduced pressure. The residue is taken up in benzene, washed with water, dried over anhydrous sodium sulfate and the solution is evaporated under reduced pressure. After recrystallizing the residue from acetonitrile the title product is obtained in 68.4% yield, m.p.: 122°-123° C. After filtering off the inorganic salts the solution is evaporated under reduced pressure washed with water dried over anhydrous sodium sulfate the solution is evaporated under reduced pressure After recrystallizing the residue from acetonitrile the title product is obtained in 68.4% yield, m.p.: 122°-123° C.